Initial import of i3lock 0.9

LICENSE

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+MIT/X Consortium License
+
+© 2006-2008 Anselm R Garbe <garbeam at gmail dot com>
+© 2009 Michael Stapelberg <michael+i3lock at stapelberg dot de>
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

Makefile

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+# slock - simple screen locker
+# © 2006-2007 Anselm R. Garbe, Sander van Dijk
+# © 2009 Michael Stapelberg
+
+include config.mk
+
+SRC = i3lock.c
+OBJ = ${SRC:.c=.o}
+
+all: options i3lock
+
+options:
+	@echo i3lock build options:
+	@echo "CFLAGS   = ${CFLAGS}"
+	@echo "LDFLAGS  = ${LDFLAGS}"
+	@echo "CC       = ${CC}"
+
+.c.o:
+	@echo CC $<
+	@${CC} -c ${CFLAGS} $<
+
+${OBJ}: config.mk
+
+i3lock: ${OBJ}
+	@echo CC -o $@
+	@${CC} -o $@ ${OBJ} ${LDFLAGS}
+
+clean:
+	@echo cleaning
+	@rm -f i3lock ${OBJ} i3lock-${VERSION}.tar.gz
+
+dist: clean
+	@echo creating dist tarball
+	@mkdir -p i3lock-${VERSION}
+	@cp -R LICENSE Makefile README config.mk ${SRC} slock-${VERSION}
+	@tar -cf i3lock-${VERSION}.tar i3lock-${VERSION}
+	@gzip i3lock-${VERSION}.tar
+	@rm -rf i3lock-${VERSION}
+
+install: all
+	@echo installing executable file to $(DESTDIR)$(PREFIX)/bin
+	$(INSTALL) -d $(DESTDIR)$(PREFIX)/bin
+	$(INSTALL) -m 4755 i3lock $(DESTDIR)$(PREFIX)/bin/i3lock
+
+uninstall:
+	@echo removing executable file from $(DESTDIR)$(PREFIX)/bin
+	@rm -f $(DESTDIR)$(PREFIX)/bin/i3lock
+
+.PHONY: all options clean dist install uninstall

README

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+i3lock - slightly improved screen locker based on slock
+============================
+i3lock improves slock by making it fork() and therefore combinable with
+commands to suspend your computer. Additionally, instead of turning of
+your screen via DPMS and/or displaying a black screen, i3lock displays a
+white screen so you can see if your computer failed to resume from suspend
+or if your screen is just locked. Also, when entering a wrong password,
+i3lock does not call XBell(). This is important because i3lock/slock think
+you’ve entered a password when resuming from suspend, at least sometimes.
+
+i3lock was forked from slock-0.9
+
+Requirements
+------------
+In order to build i3lock you need the Xlib header files.
+
+
+Installation
+------------
+Edit config.mk to match your local setup (slock is installed into
+the /usr/local namespace by default).
+
+Afterwards enter the following command to build and install slock
+(if necessary as root):
+
+    make clean install
+
+
+Running i3lock
+-------------
+Simply invoke the 'i3lock' command. To get out of it, enter your password.

config.mk

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+# slock version
+VERSION = 0.9
+
+# Customize below to fit your system
+
+# paths
+PREFIX = /usr
+
+X11INC = /usr/X11R6/include
+X11LIB = /usr/X11R6/lib
+
+# includes and libs
+INCS = -I. -I/usr/include -I${X11INC}
+LIBS = -L/usr/lib -lc -lcrypt -L${X11LIB} -lX11 -lXext
+
+# flags
+CPPFLAGS = -DVERSION=\"${VERSION}\" -DHAVE_SHADOW_H
+CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
+LDFLAGS = -s ${LIBS}
+
+# On *BSD remove -DHAVE_SHADOW_H from CPPFLAGS and add -DHAVE_BSD_AUTH
+# On OpenBSD and Darwin remove -lcrypt from LIBS
+
+# compiler and linker
+CC = cc
+INSTALL=install

i3lock.c

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+/* See LICENSE file for license details. */
+#define _XOPEN_SOURCE 500
+#if HAVE_SHADOW_H
+#include <shadow.h>
+#endif
+
+#include <ctype.h>
+#include <pwd.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <X11/keysym.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#if HAVE_BSD_AUTH
+#include <login_cap.h>
+#include <bsd_auth.h>
+#endif
+
+static void
+die(const char *errstr, ...) {
+	va_list ap;
+
+	va_start(ap, errstr);
+	vfprintf(stderr, errstr, ap);
+	va_end(ap);
+	exit(EXIT_FAILURE);
+}
+
+#ifndef HAVE_BSD_AUTH
+static const char *
+get_password() { /* only run as root */
+	const char *rval;
+	struct passwd *pw;
+
+	if(geteuid() != 0)
+		die("slock: cannot retrieve password entry (make sure to suid slock)\n");
+	pw = getpwuid(getuid());
+	endpwent();
+	rval =  pw->pw_passwd;
+
+#if HAVE_SHADOW_H
+	{
+		struct spwd *sp;
+		sp = getspnam(getenv("USER"));
+		endspent();
+		rval = sp->sp_pwdp;
+	}
+#endif
+
+	/* drop privileges */
+	if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
+		die("slock: cannot drop privileges\n");
+	return rval;
+}
+#endif
+
+int
+main(int argc, char **argv) {
+	char curs[] = {0, 0, 0, 0, 0, 0, 0, 0};
+	char buf[32], passwd[256];
+	int num, screen;
+
+#ifndef HAVE_BSD_AUTH
+	const char *pws;
+#endif
+	unsigned int len;
+	Bool running = True;
+	Cursor invisible;
+	Display *dpy;
+	KeySym ksym;
+	Pixmap pmap;
+	Window root, w;
+	XColor black, dummy;
+	XEvent ev;
+	XSetWindowAttributes wa;
+
+	if((argc == 2) && !strcmp("-v", argv[1]))
+		die("slock-"VERSION", © 2006-2008 Anselm R Garbe\n");
+	else if(argc != 1)
+		die("usage: slock [-v]\n");
+
+#ifndef HAVE_BSD_AUTH
+	pws = get_password();
+#endif
+
+	if(!(dpy = XOpenDisplay(0)))
+		die("slock: cannot open display\n");
+	screen = DefaultScreen(dpy);
+	root = RootWindow(dpy, screen);
+
+	if (fork() != 0)
+		return 0;
+
+	/* init */
+	wa.override_redirect = 1;
+	wa.background_pixel = WhitePixel(dpy, screen);
+	w = XCreateWindow(dpy, root, 0, 0, DisplayWidth(dpy, screen), DisplayHeight(dpy, screen),
+			0, DefaultDepth(dpy, screen), CopyFromParent,
+			DefaultVisual(dpy, screen), CWOverrideRedirect | CWBackPixel, &wa);
+	XAllocNamedColor(dpy, DefaultColormap(dpy, screen), "black", &black, &dummy);
+	pmap = XCreateBitmapFromData(dpy, w, curs, 8, 8);
+	invisible = XCreatePixmapCursor(dpy, pmap, pmap, &black, &black, 0, 0);
+	XDefineCursor(dpy, w, invisible);
+	XMapRaised(dpy, w);
+	for(len = 1000; len; len--) {
+		if(XGrabPointer(dpy, root, False, ButtonPressMask | ButtonReleaseMask | PointerMotionMask,
+			GrabModeAsync, GrabModeAsync, None, invisible, CurrentTime) == GrabSuccess)
+			break;
+		usleep(1000);
+	}
+	if((running = running && (len > 0))) {
+		for(len = 1000; len; len--) {
+			if(XGrabKeyboard(dpy, root, True, GrabModeAsync, GrabModeAsync, CurrentTime)
+				== GrabSuccess)
+				break;
+			usleep(1000);
+		}
+		running = (len > 0);
+	}
+	len = 0;
+	XSync(dpy, False);
+
+	/* main event loop */
+	while(running && !XNextEvent(dpy, &ev)) {
+		if(ev.type == KeyPress) {
+			buf[0] = 0;
+			num = XLookupString(&ev.xkey, buf, sizeof buf, &ksym, 0);
+			if(IsKeypadKey(ksym)) {
+				if(ksym == XK_KP_Enter)
+					ksym = XK_Return;
+				else if(ksym >= XK_KP_0 && ksym <= XK_KP_9)
+					ksym = (ksym - XK_KP_0) + XK_0;
+			}
+			if(IsFunctionKey(ksym) || IsKeypadKey(ksym)
+					|| IsMiscFunctionKey(ksym) || IsPFKey(ksym)
+					|| IsPrivateKeypadKey(ksym))
+				continue;
+			switch(ksym) {
+			case XK_Return:
+				passwd[len] = 0;
+#ifdef HAVE_BSD_AUTH
+				running = !auth_userokay(getlogin(), NULL, "auth-xlock", passwd);
+#else
+				running = strcmp(crypt(passwd, pws), pws);
+#endif
+				len = 0;
+				break;
+			case XK_Escape:
+				len = 0;
+				break;
+			case XK_BackSpace:
+				if(len)
+					--len;
+				break;
+			default:
+				if(num && !iscntrl((int) buf[0]) && (len + num < sizeof passwd)) { 
+					memcpy(passwd + len, buf, num);
+					len += num;
+				}
+				break;
+			}
+		}
+	}
+	XUngrabPointer(dpy, CurrentTime);
+	XFreePixmap(dpy, pmap);
+	XDestroyWindow(dpy, w);
+	XCloseDisplay(dpy);
+	return 0;
+}